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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Intangible assets (Details) | 12 Months Ended
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Dec. 31, 2018
Minimum |
Prepaid land use right |
Period over which land use rights in China and Japan are charged to earnings | 20 years
Maximum |
Prepaid land use right |
Period over which land use rights in China and Japan are charged to earnings | 50 years
Technical know-how |
Intangible assets |
Amortization period | 10 years
Computer software | Minimum |
Intangible assets |
Amortization period | 1 year
Computer software | Maximum |
Intangible assets |
Amortization period | 10 years

X
- Definition Represents the period over which land use rights are charged to earnings in accordance with the term of the land use right agreement. + References No definition available. + Details
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Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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- Details
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X
- Details
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Data Type: | na
Balance Type: |
Period Type: |